Revealjs code-line-numbers does not work when exported to pdf

[dsfeorg]

Description

When I export revealjs using the "pdf export mode" the code-line-numbers does not work in the pdf document. In the example below the second line should be highlighted and it works on revealjs but not when exported in pdf. I have tried with both jupyter and knitr engines but no luck. Is there a way to make it work?

Steps to reproduce:

1. Create a qmd document and copy and paste the code below. It will generate a simple revealjs presentation.
2. The code in line 2 is highlighted in the revealjs presentation.
3. Click the hamburger menu and go to 'Tools' and then to 'PDF Export Mode'
4. Print to pdf using the browser.

The pdf document does not have the code highlighted. I hope I was able to explain.

---
title: "Title"
format: revealjs
---

## Quarto

When you click the **Render** button a presentation will be generated that includes both content and the output of embedded code. You can embed code like this:

```{r}
#| eval: false
#| echo: true
#| code-line-numbers: "2"
1 + 1
2 + 1
```

Quarto version: 1.7.31
Linux Pop_OS 22.04
Browser: Mozzila Firefox

[mcanouil]

Could you properly format your post using code blocks for code and terminal outputs? Thanks.
If your code contains code blocks, you need to enclose it using more backticks, i.e., usually four ````.
See https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us.

---

You are using two very different concepts to express what I believe to be one single case: "the rendered pdf document" and "when exported in pdf".

Would you mind explaining what you mean and the steps to reproduce?

[mcanouil]

Note that if you are talking about the native (to Reveal.js) "export", it's known to have various limitations which you can find on Reveal.js repository and here in the discussions.
One of the current best way to export Reveal.js slides is to use Decktape (as discussed in many other discussions).

See for example the last section of this blog post of mine: https://mickael.canouil.fr/posts/2025-04-21-quarto-revealjs-tabset-pdf/#exporting-to-pdf

[dsfeorg]

Thank you. I have made the changes. I will try the Decktape tool.

[mcanouil]

(We don't close discussions as the default search on GitHub filters out closed ones)